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The field of computational and data-driven materials engineering has transformed from traditional high-throughput simulations to sophisticated ecosystems integrating machine learning with multimodal datasets for accelerated discovery. This review synthesizes recent advancements in materials informatics, emphasizing the role of graph neural networks and deep learning in processing complex structural and property data. We examine multimodal datasets that combine experimental, computational, and textual modalities, enabling robust representation learning and uncertainty quantification. Integration frameworks are discussed, including active learning loops and multi-fidelity models that bridge simulation and experiment, addressing challenges like data sparsity and distribution shifts. The discovery potential is highlighted through applications in property prediction, inverse design, and autonomous systems, such as identifying stable alloys and energy materials. By providing an original synthesis of these elements, this article underscores the shift toward closed-loop workflows that enhance generalizability and interpretability, while identifying gaps in handling finite-temperature stability and disordered systems. Ultimately, these approaches promise to expand the known materials space by orders of magnitude, fostering innovations in sustainable technologies.